Effects of Assam tea extract on growth, skin mucus, serum immunity and disease resistance of Nile tilapia (Oreochromis niloticus) against Streptococcus agalactiae

Abstract

The present study aimed to assess the possible effects of Assam tea (Camellia sinensis) extract (ATE) on growth performances, immune responses, and disease resistance of Nile tilapia, Oreochromis niloticus against Streptococcus agalactiae. Five levels of ATE were supplemented into the based diet at 0, 1, 2, 4, and 8 g kg-1 feed of Nile tilapia fingerlings (10.9 ± 0.04 g initial weight) in triplicate. After four and eight weeks of feeding, fish were sampled to determine the effects of the tea supplements upon their growth performance, as well as serum and mucosal immune responses. A disease challenge using S. agalactiae was conducted at the end of the feeding trial. Fish fed ATE revealed significantly improved serum lysozyme, peroxidase, alternative complement (ACH50), phagocytosis, and respiratory burst activities compared to the basal control fed fish (P<0.05). The mucus lysozyme and peroxidase activities were ameliorated through ATE supplementation in the tilapia diets. Supplementation of ATE significantly (P<0.05) enhanced final body weight, weight gain, and specific growth rate; while a decreased feed conversion ratio was revealed at 2 g kg-1 inclusion level, after four and eight weeks. Challenge test showed that the relative percent survival

Extract of grape seed enhances the growth performance, humoral and mucosal immunity, and resistance of common carp (Cyprinus carpio) against Aeromonas hydrophila

“…These additives could augment the growth of beneficial microbial colonies in the digestive tract, which leads to enhance feed intake and weight gain of various aquatic species (Safari et al, 2017). Increased resistance against infectious diseases of aquatic species following the administration of different medicinal plants was also shown previously (Van Doan et al, 2019b;Van Doan et al, 2019c;Yin et al, 2008).…”

“…Medicinal plants have widely attracted the aquaculture researchers because of their beneficial influence on fish such as improving the innate immune responses, improving growth, and feed digestibility (Adel et al, 2016b;Mahmoud et al, 2019;Van Doan et al, 2019b;Van Doan et al, 2019c). These additives could augment the growth of beneficial microbial colonies in the digestive tract, which leads to enhance feed intake and weight gain of various aquatic species (Safari et al, 2017).…”

The new aspects of using some safe feed additives on alleviated imidacloprid toxicity in farmed fish: a review

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The Dietary Effect of Vitex agnus-castus Hydroalcoholic Extract on Growth Performance, Blood Biochemical Parameters, Carcass Quality, Sex Ratio and Gonad Histology in Zebrafish (Danio rerio)

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